I029 N over Six Mile Ck
FairBrookings County, South Dakota · 1.1 N US14 By-Pass · Structure no. 000000006185139
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected August 2023
- Type
- Slab
- Concrete Continuous
- Length
- 129 ft
- 5 main spans
- Daily traffic
- 6,165
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I029 N over Six Mile Ck is a concrete continuous slab carrying I029 N over Six Mile Ck in Brookings County, South Dakota. It was built in 1970, so it is 55 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 6,165 vehicles a day, roughly 23% of them trucks, projected to reach 10,030 by 2044. The structure is 129 ft (39.2 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I029 N over Six Mile Ck built?
It was built in 1970, making it 55 years old in 2025.
What condition is I029 N over Six Mile Ck in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does I029 N over Six Mile Ck carry?
About 6,165 vehicles per day (2024 count), of which roughly 23% are trucks.
How long is I029 N over Six Mile Ck?
The structure is 129 ft (39.2 m) long with a longest span of 26 ft (7.9 m) and a deck 41 ft wide.
Who owns I029 N over Six Mile Ck?
It is owned by the State Highway Agency.